Home / 20,538.78-28,338.30-12,578.10

Finding the Fourth Proportional to 20,538.78, 28,338.30 and 12,578.10

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Solution

The fourth proportional to 20,538.78, 28,338.30 and 12,578.10 is: 17,354.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,538.78 : 28,338.30 = 12,578.10 : x
  2. Step 2: Convert to fraction form
    20,538.78/28,338.30 = 12,578.10/x
  3. Step 3: Cross multiply
    20,538.78x = 28,338.30 × 12,578.10
  4. Step 4: Simplify right side
    20,538.78x = 356,441,971.23
  5. Step 5: Solve for x
    x = 356,441,971.23/20,538.78
  6. Step 6: Final answer
    x = 17,354.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.